Who is the author? Are they experts in the subject?
Can they be contacted?
What is the purpose of the source?
To inform? teach? sell? entertain? persuade? Which of these might be most valuable to you as a source?
Fact or opinion based?
Are the claims/conclusions supported?
Where did you find the info?
Where does the money come from?
Why would I use the source?
Why is the source reliable?
When was the info created or updated?
Has new research been done?
Does it matter to you if it's current?